/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package com.ibm.bi.dml.runtime.instructions.spark.functions;

import org.apache.spark.api.java.function.Function;

import scala.Tuple2;

import com.ibm.bi.dml.runtime.matrix.data.MatrixBlock;
import com.ibm.bi.dml.runtime.matrix.data.MatrixIndexes;

/**
 * Function class that finds the index of last cell in the given matrix block.
 */
public class LastCellInMatrixBlock implements Function<Tuple2<MatrixIndexes, MatrixBlock>, MatrixIndexes> {

	private static final long serialVersionUID = -4930522353195801521L;

	int _rpb, _cpb;
	
	public LastCellInMatrixBlock(int rpb, int cpb) {
		_rpb = rpb;
		_cpb = cpb;
	}
	
	@Override
	public MatrixIndexes call(Tuple2<MatrixIndexes, MatrixBlock> v1)
			throws Exception {
		
		// Find the indices of last cell in the block
		long r = _rpb * (v1._1().getRowIndex()-1) + v1._2().getNumRows();
		long c = _cpb * (v1._1().getColumnIndex()-1) + v1._2().getNumColumns();
		
		return new MatrixIndexes(r, c);
	}
	
}

